Import patches-unapplied version 1.2.6-0ubuntu0.16.04.1 to ubuntu/xenial-proposed

Imported using git-ubuntu import.

Changelog parent: 93540f8be89eccf0fa53fa4ac758c097aa66b8ab

New changelog entries:
* Rebase to upstream 1.2.6 release (LP: #1645698)
* debian/rules: allow parallel building (copied from yakkety)
* Dropped patch that was included in new release:
- manager-fix-state-transition-on-resuming-from-sleep.patch
* Restored Don-t-block-network.target-on-NetworkManager-wait-on.patch
- This patch makes it easy to disable the service by tweaking the
service file. The patch had been dropped because it didn't seem
useful any more, but it was later re-introduced to both Debian and
Ubuntu 16.10.
* Refresh remaining patches